Preheat a panini press or a grill pan over medium heat.
Assemble the Panini: Spread mayo and mustard on the inside of each piece of bread. Layer half the slices with turkey, apple slices, and brie. Top with the remaining bread slices.
Grill the Panini: Place the assembled panini onto the preheated panini press or grill pan. Cook for about 3-4 minutes, or until the bread is golden brown and the cheese has melted.
Mix the sparkling water and lemon.
Serve the Meal: Cut the turkey panini in half. Serve with chips, pickle, and sparkling water.